What are the electrodes called in a mosfet transistor?

Below:

Explanation:

In a MOSFET, the current input and output electrodes are called source and drain. They are defined by local implantation of complementary doping species (n for p-well and p for n-well) very close to the surface, thereby forming shallow p–n or n–p junctions, depending on the transistor type.

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# It's Muska

a and b sometimes have a positive value

explanation:

wheres the pic